Nyan blaze has been showing red status consistently for a few builds now. 
https://cros-goldeneye.corp.google.com/chromeos/healthmonitoring/buildHealthDashboard?waterfall=chromeos_release&item-checkbox-canary=on&buildTypes=canary&isImportant=true&startTimeFrom=&startTimeTo=

Further investigation reveals that dummy_PassServer.sanity is failing:
http://cautotest.corp.google.com/afe/#tab_id=view_job&object_id=116830701

Looking at the log for that job, here is the output:
FAIL	----	----	timestamp=1494485112	localtime=May 10 23:45:12	Failed to setup container for test: Command <sudo lxc-start -P /usr/local/autotest/containers -n test_116830701_1494485076_28871 -d> failed, rc=1, Command returned non-zero exit status
  * Command: 
      sudo lxc-start -P /usr/local/autotest/containers -n
      test_116830701_1494485076_28871 -d
  Exit status: 1
  Duration: 5.77462506294
  
  stderr:
  lxc-start: tools/lxc_start.c: main: 366 The container failed to start.
  lxc-start: tools/lxc_start.c: main: 368 To get more details, run the container in foreground mode.
  lxc-start: tools/lxc_start.c: main: 370 Additional information can be obtained by setting the --logfile and --logpriority options.. Check logs in ssp_logs folder for more details.